Finding the Fourth Proportional to 1,521.50, 2,101.48 and 1,081.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.50 : 2,101.48 = 1,081.31 : x
2. Step 2: Convert to fraction form
   1,521.50/2,101.48 = 1,081.31/x
3. Step 3: Cross multiply
   1,521.50x = 2,101.48 × 1,081.31
4. Step 4: Simplify right side
   1,521.50x = 2,272,351.34
5. Step 5: Solve for x
   x = 2,272,351.34/1,521.50
6. Step 6: Final answer
   x = 1,493.49